CVE-2026-47303: CWE-302: Authentication Bypass by Assumed-Immutable Data in Microsoft .NET 10.0
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-47303) involves an authentication bypass caused by assumed-immutable data in ASP.NET Core within Microsoft .NET 10.0. An attacker with some level of authorization can exploit this flaw to elevate their privileges remotely. The vulnerability is classified under CWE-302 (Authentication Bypass) and has a CVSS v3.1 score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue.
Potential Impact
Successful exploitation allows an attacker with existing authorization to bypass authentication controls and elevate privileges, potentially leading to full compromise of affected systems. The vulnerability impacts confidentiality, integrity, and availability of the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303 to remediate this vulnerability.
CVE-2026-47303: CWE-302: Authentication Bypass by Assumed-Immutable Data in Microsoft .NET 10.0
Description
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 8.8high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-47303) involves an authentication bypass caused by assumed-immutable data in ASP.NET Core within Microsoft .NET 10.0. An attacker with some level of authorization can exploit this flaw to elevate their privileges remotely. The vulnerability is classified under CWE-302 (Authentication Bypass) and has a CVSS v3.1 score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue.
Potential Impact
Successful exploitation allows an attacker with existing authorization to bypass authentication controls and elevate privileges, potentially leading to full compromise of affected systems. The vulnerability impacts confidentiality, integrity, and availability of the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-18T23:53:33.898Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303","vendor":"Microsoft"}]
Threat ID: 6a56883a68715ace43099963
Added to database: 07/14/2026, 19:04:26 UTC
Last enriched: 07/14/2026, 19:17:48 UTC
Last updated: 07/14/2026, 20:03:47 UTC
Views: 6
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